Chain grate



V. V. VEENSCHOTN.

CHAIN GRATE.

APPLICATION. FILED SEPT. 2o, 19'19.

Patented Dec. 27, 1921.

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CHAIN GRATE.

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Specieation of Letters Patent.

Patented Dec. 27, 1921.

Application led September 20, 1919. Serial No. 325,189.

To all whom t may concern.'

Be it known that l,VrNo13NT V. VEEN- scno'rnN, a citizen ol the United States, residing at Erie in the county of Erie and State et Pennsylvania, have inventedycertain new and useful improvements in Chain Gratos, or vhich the following is a specilication.

This ini/'ention relates to improvements in chain gratos, and particularly that type ot grate or Stoker which is known in the trade as the Corre stoken The invention has for its objectproviding means lor replacing certain parts ot the grate when they become broken or defective. lt has been found that the present method o1'l replacing the parts require-s so much time that it is usually noccss im either to stop the operation of the grate or to remove large parts thereof and keep on4 hand reserve parts in order to replaceA the broken or injured ele ments, and my invention provides means for obviatingr this delay and trouble.

@it the accom'ianying drawings Figure 1 is'an end view oit a portion ot a chain grate which embodies Athe features of my invention. 2 is an enlarged end view of one oit the bars of the grate. Fig. 3 is a side elevation otov portion of the bar with some of the elements thereof removed. Fig. et is a plan view ont the portion of the bar shown in Fig'. Fig.. 5 is an elevation of oneV ot the units or l'eys which are to be replaced when broken.

The chain grate is composed of a series of ,Qjrate bars 5 fixed at each end in a. suitable manner tto a chain 6, which is operated by the sprocket wheel suitably mounted and driven. As is well understood the bars of the grate are by these means carried under the lire bed ot the furnace and form a suitable support therefor in an ordinary man ner. Each ot the bars ot the grate is composed ol a body portion 8 upon which is mounted securing; ribs 10 and a series of keys 9. These keys, while fitting fairly snugly together. are sufficiently spaced apart-to allow air to pass up, or be forced up, from below into the lire bed above. The keys are slidably mounted on securing ribs 10; these ribs extending substantially the full length of the bar, and the keys having suitable recesses 11 therein by means of which they are mounted on the ribs. The ends of the grate bars comprise heads 12,

and it is common to have a portion ofthe ribs at one end, adjacent the head 12, removable, by suitable means, so that in case of a fracture or injury to any ot the keys this portion ot the rib may be removed, together with the first key, and other keys may be removed by sliding' them alongthe ribs tothe end tbereol1 until the broken key is reached and removed and replaced. The keys are then replaced and the removable portions oi the ends of the ribs are also replaced together with the first key. lt is diiiicult, however, to A.remove the rib ends for various reasons, partly because fastening means have been used which require the operator to work on the inner side ol the sprocket wheel 7 .j hence necessitating stopping the grate. To avoid this it has been customary to remove the entire bar from the chain and replace it by another assembled reserve bar, as this can be ldone while the grate is in operation, it being` understood that the rate of movement ofthe grate is so slow that the end bars will be exposed 'for several minutes.V

To avoid the necessity of having a reserve bar andreplacing1 the entire bar, l provide a removable ller member 11i which is adjacent1 the ends 18 of the ribs and connect the same to the head by suitable means extending outwardly to the end of the bar. l pieter for this connecting purpose a bolt 15. which passes through the head 12 and is screwed into the member 14, the head of the bolt passing into a recess 16 in the head 12. By this arrangement it is necessary, in order to remove one of the keys, only to remove the bolt and then the member 14C, and the keys may be slipped oil" of the ends ot the ribs. It is thus not necessary to work on the inner side of the wheel 7. To replace a broken key, it is necessary only to remove such key, to remove the bolt 15 and filler member le, to insert a new key at the ends ot' the ribs, and by forcing the same into operative position thereon., to slide the intervening' keys along the ribs to lill the gap without stopping the operation ot the grate or without removing the entire bar. The bar is connected to the chain 6 by means of a pin 18 passing' through the chain link and also through a hole 19 in the lug 17, liXed t0 the head.

I claimas my invention:

A grate bar comprising a body portion, a

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heedL mounted on one end of said body poling` tlnfon'gh said head and screwed into ASeid tion, and longitudinal securing` ribs mounted member, the sgaee between the seid head on Seid body `portion, in Combination Withe and the ends of Vsaid ribs being greater than 10 plurality of nelsuppoi'ting keys Slidably theiwidth Ofeaeh of Said keys.

5 secured onY Said ribs, a ller member' ln'testimony whereof, I hereunto set my mounted between said head and theVY adhand.

jacent ends of said ribs, and a` bolt pess- VINCENT V. VEENSCHOTEN. 

